Drilling machine



Oct. 28, 1930.

' E, J. KINGSBURY DRILLING MACHINE Filed Oct. 19, 1927 4 Sheets-Sheet lhmm llll, l.

Oct. 28, 19,30. E. J. KINGSBURY 1,780,083

DRILLING MACHINE Oct. 28, 1930. E. J. KINGSBURY 1,780,083

DRILLING MACHINE Filed Oct. 19, 1927 l`.4 Sheets-Sheet 4 U i L a m.Ewen/n' Edu/ard J 113235455 ray,

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Patented ,Oct 28, 1930- UNITED STATES EDWARD JOSLIN KINGSBURY,

DBILLING MACHINE Application lcd October 19, 1927. Serial No. 227,227.

The invention relates to new and useful improvements in automaticdrilling machines, and more particularly to the means for imparting arecipropating feed movement to the drill spindle.

An object Aof the invention is to provide a drilling machine withautomatic means for imparting a reciprocating feed movement to the drillspindle, which automatic means,

fthe manual controlling means for the Ina-V while it includes a rotatingmeans for imparting feed movement to said spindle also includes deviceswhereby vthe extent of forward movement of the spindle for each rotationof the drill spindle is diminished lwhen the drill engages the material,to conform to the cutting capacity of the drill.

A further object of the invention is to provide an automatic drillfeeding means whereby a rotating member is utilized'for impart-4 ingforward movement to the s indle, and said rotati member is actuate bydevices which inclu e a clutch having friction members whi ch 'arecaused to slip or be disengaged when the forward movement of the drillis resisted to a predetermined degree, so that the extent of forwardmovement given the spindle for each rotation of the drill may bediminished to conform to the cutting capacity I of the drill.

' for controlling the separation of the friction A still further objectof the invention is to provide an automaticmeans for imparting areciprocating feed movementl tov the spindle of the above type, whereinthe means clutch 'members maybe adjusted uso* as to var the degree ofresisting pressure, which wi bring about a s lippi ofJV the clutchmembers ora` se arationoft esame.

Theseand ot er objects will in part. be obvious and willin part behereinafter more fully disclosed.

In the drawings WliCh show Figure 1 ispa side view of av drillingmachine embodymg the improvements.

Fig. 2 is'a ongitudinalv sectionalsview through the housing and the suporting and operating parts for'the spin e. Fig. 3 is. an end- 'ew ofthe housing as viewed from the left in Fig. 2.-'.

Fig. 4 isA a transverse sectional view through the housing on -the line-4--4 of ig. 5 'is a transverse sectional view hroigh the housing on theline 5-5 of 1 ig. 6 is a longitudinal sectional vie on the line of theactuating cross shaft.

Fig. 7 is a detail partly in section showing chine. l

The invention is directed broadly to an automatic drilling machine whichincludes a spindle which is driven by a motor. The spindle is mounted'in the .housing so that it may be rotated and may'also'be moved endwisefor imparting a feed movement to the drill. The invention is directedmore particularly to the means which imparts a feed Imovement to thedrill spindle.

The drill spindle is mounted in a sleeve which is capable of endwisemovement in the housing therefor, and when this sleeve is .moved endwiseit will impart an endwise movement to the drill spindle and thus afeeding movement to the drill. The sleeve is pro-- vided with a rackwhich engages a pinion, which pinion is rotated first in one directionand then the other for reciprocating the sleeve, and thus moving thedrill forward into the material and retracting the same from thematerial.' This pinion is -mounted cna shaft which is rotated first inone direction and then the other by an oscillating segment gear. `Theoscillatingsegment gear l,is in turn oscillated by a rotating cammounted on a shaft which supports a worm gear, and the worm gear mesheswith a worm mounted -on a shaft which carries one member of a frictionclutch fixed thereto.. The cooperating member of the friction clutch ismounted on ax shaft jour by way ofL illustration. one embodiment of theinvention to retract the drill. first. in one direction and then in' theother The worm/wheel in the sense becomes a nut s and as theworm creepsalong the nut it will move the friction clutch member carried therebyout ofl engagement with the other member of the clutch, and this willeither cause the clutch members to slip or be entirely separated. Assoon as the restricting pressure against the spindle is relieved, thenthe spring will move the shaft and thus feed the drill forward.

Referring more in detail to the drawings, the invention is embodied in amachine which includes a base portion 1 carrying a housing 2. Mounted inthis housing is a drill spindle 3 to which drills of the desired typemay be attached in the usual way. The drill spindle 3 is mounted in asleeve 4 which in turn is carried by bearings 5-5 mounted in thehousing. The spindle is connected to the sleeve'so that it rotates withthe sleeve, but it also has an endwise movement in thel sleeve. Thesleeve has no endwise movement in the housing, but is rotated by apinion 6 meshing with a pinion 7 on the end of the motor shaft 8 of themotor M, which is secured by suitable supporting devices to the housingof the drilling machine.

The drill spindle is mounted at its right hand end, as viewed in Fig. 2,in a sleeve 9.

There is a bearing 10 for supporting the spindle at the outer end of thesleeve, so that the spindle rotates freely in the sleeve. There is alsoa thrust bearing 11 at the outer end of the sleeve, which engages acollar on the spindle so that the endwise movements of the sleeve 9shall shift the rotating position of the spindle in the sleeve 4.

The sleeve 9 is provided with a rack on-its lower face, which rackmeshes with a pinion 13. rIfhe pinion 13 is carried by a cross-shaft 14mounted in bearings in the housing 1.

The cross-shaft 14 carries a pinion 15 on its inner end. The pinion hasa tapered opening therein and the shaft 14 has a tapered portion whichis drawn into engagement with thetapered portion of the pinion 15 by theaid of a nut 16 Aat the other end of the shaft. By loosening the nut 16the pinion 15 may be shifted-on its shaft. This is for the purpose ofadjustment.

It'will be noted that `as the shaft 14 is rotated in one direction, thesleeve 9 Will be moved so as to feed the drill forward, and when theshaft 14 is rotating in the other direction, then the sleeve 9 will bemoved so as This shaft 14 is rotated by a segment gear 17. This segmentgear meshes with t e pinion 15. The segment gear is pivoted at 18 and isprovided with a roller 19 which runs in a cam groove 20 formed in a camdisk 21 (see Figs. 1 and 4). This cam disk 21 is mounted on across-shaft 22 mounted in suitable bearings in the housing. Thecross-shaft 22 carries a worm gear 23 which meshes with a worm 24 (seeFig. 6)

The worm 24 is'formed in a shaft 25. This 'shaft 25 .is mounted at itsright hand end in sleeve shaft 27. The sleeve shaft 27 is mounted inball-bearings 28, 28 carried by the housing.

This sleeve shaft 27 carries a member 29 of a friction clutch. The othermember 3() of thefriction clutch is mounted on the shaft 25. When theparts are in the position in Fig. 6, then the clutch members 29 and 30.are in engagement and any rotations imparted to the shaft 27 will betransmitted to the shaft 25. The shaft 27 is rotated by a pinion 31.

The pinion 31 is driven from a pinion 32 on the sleeve 4 throughanintermediate pinion 33. From the above it will be apparent that themotor rotates the spindle, and through the pinions 32, 33 and 31 impartsa continuous rotation to the sleeve shaft 27. When the clutch membersare in engagement,

the shaft 25 willbe rotated, and this will ro' tate the worm gear 23,which in turn rotates the cam 21 and the cam 21 will oscillate thesegment gear, which, through its train of connection, will cause thesleeve 9 to move endwise.

' The sleeve 9 will thus be moved in one direction, so long as the..segment gear is moved in one directionf, and when it reverses itsdirection of movement by the action of the cam groove thereon, then tfhespindle will be retracted. Thus it is that reciprocating movements willautomatically be imparted tothe drill spindle through the same drivingmeans for rotating the spindle. The machine is therefore automatic inits operation.

-When the' drill xengages the material the forward movement ofthe drillwill be restrained, and this restraining movement will .the worm on theshaft 25 will cause the worm vto creepV or move to the right, as viewedin Fig. 6.' This movement of the worm to the right-will canse, in turn,thev members of the -shaft .25 toL stop rotation. ,The shaft is movedendwise by a spring 34 which bears vagainst a member 35 threaded intothe end of the sleeve 26. l The sp ing34 at its right hand end bearsagainst a abutmentl 37 threaded into a sleeve 38, which in turn has athreaded engagement with the housing. By adjusting the abutment 37through the turning of the same, the tension of the spring may bevaried. By varying the tension of the spring, the degree of restrainingpressure which will cause the members of the clutch to separate willalso be varied. 4

In the operation of the machine, let us assume that a drill comes incontact with the material, then it is desired to regulate the away willalways depend upon the eiiciency of the drill and the character of thematerial being cut. Whatever that may be, it is desired that the forwardfeed of the drill shall conform to the cutting away of the material bythe drill. It will readily be seen that when the drill engages thematerial, that its forward movement will be restrained, and this,through the restraining of the movement of the worm gear, will cause theclutch members to be separated to a slight extent, causing slipping inthe clutch, and thus a slower forward feed of the drill spindle. If avery hard spot is engaged by the drill so that for an instant there isno possible forward feed of the drill, then the clutch members will beentirely separated and the feed in the forward direction will cease.Just as soon, however, as the drill can move forward, then the spring 34will move the shaft 25 endwise, and through the worm turn the wormwheel, causing the drill to move forward, and as soones the drill hasmoved a suiicient distance, then the action of the spring will bring theclutch members .into engagement, and the worm wheel will be turned bythe clutch and the forward feed of the drill continued.

From the above it will be apparent that I have provided a rotating meansfor imparting a forward movement to the drill spindle,

so that the drill spindle is in a sense positive-v ly moved forward, andthe forward movement of the drill is regulated by a positive feed.Nevertheless, when conditions of drilling are reached, then vthe feedmovement imparted to the spindle is regulated to conform to thecutting'away ofthe material bythe drill. This may be a very muchdiminished A forward feed movement of the drill, or the drill mayactually stop in its forward-'movement, until it has cut through anextremely -hard part and ready to proceed. lAtv no time is the means forfeeding the spindle forward out of control, and if a soft s ot isreached in 'the material, there willv e no jumping forward of the drill,-as the clutch will close immediately and take up the control of theforward feed of the drill spindle.

'The feeding movement impar-ted to the drill spindle may bev stopped ata predetermined point by'devices shown in Figs. 1 and y 7 of thedrawings. These devices include a stop or dog 40 mgunted on the cam 21.The

position of this stop on the cam will deter-- mine,l of course, theposition of the drill spindle when the feed is stopped.

Ad 'acent the cam 21 is a lever 41 which is pivoted so as. to swing`about-the axisof the gear segment 17. j A spring 42 operates to swingthe lever in a counter-clockwise direction on its pivotal support. Ablock 42a is carried by thislever 41. When the parts have moved totheposition shown in Fig'. 7 then the block 42a is inthe path of rotationof the stop 40 on the cam/as the cam rotates in-a`clockwise direction.When the stop engages the block this will prevent further rotation ofthe cam, and when the cam stops then the worm gear stopsandautomatically ,thev worm is'moved endwise -so that the clutch membersare disengaged from each other. This is a complete stopping of the wormgear, and therefore the clutch` members will be completely separated andno further movement imparted to the Wormgear While said. cam is heldfrom rotation. The other mem-` ber of the clutch, however, and the drillspindle will continue their rotation.

The lever 41 is manually controlled by a hand lever 43 which is pivotedat 44 to the housing, andis connected by a link 45 with the lever 41. Aspring 46 tends to raise the hand lever-43 sothat when the hand lever isreleased, the lever 41 will be raised and the stop moved into'positionto stop the feed of l the drill. In order toI limit 'and to properlyposition the block when the hand lever 1s re- `leased, there has beenprovided a stop Y44a start the cycle of operation, thetrip lever isdepressed, which draws the block from the path of movement of the stopand theNcam is then free to-move and the. spring 34 will move the wormand the shaft on 'which it is mountedendwise, bringing the clutchmembers into engagement, and thefeed ofthe drill spindle isautomatically and immediately resumed. p

It is obvious that minor changes in the construction and arrangement ofthe parts maybemade without departing from the spirit of the inventionas set forth in the appended claims.

What is claimed as new is:

1. ,The i combination of a drill spindle adapted to carry a drill, meansfor supporting said spindle whereby it maybe rotated and reciprocated,means for rotating the spindle, means for imparting a feeding movementto the s indle including an oscillating segment, a s aft, a cam carriedby the shaft, an arm connected to the segment and oscillated by saidcam, asleeve, means for continuously rotating said sleeve, a vclutchmember carried by said sleeve, a` shaft mounted for endwise movement inalignment with said sleeve and having a bearing in said sleeve, a clutchmember carried by said shaft and adapted to engage the clutch membercarried by the sleeve, a spiral gear carried by said shaft and meshingwith said Worm gear, a spring bearing on the end of said shaft andnormally moving said shaft endwise for engaging said clutch members,said drill spindle when restrained in the feeding movement of the drilloperating to restrain the' movement of the Worm gear vand to cause theshaft carrying the clutch member to move endwise against the action ofthe spring for separating the clutch members.

2. ,The combination of a drill spindle adapted to carry a drill, meansfor supporting said spindle wherebydt may be rotated and reciprocated,means for lrotating the spindle, means for imparting a feeding movementto the spindle including an oscillating segment, a shaft, a cam carriedby theshaft, an arm connected to the segment and oscil-A lated by saidcam, a sleeve, means for continuously rotating said sleeve, a clutchmember carried by said sleeve, a shaft mounted for endwise movement invalignment with said sleeve and having a bearing in said sleeve, aclutchmember carried by said shaft and adapted to engage the clutch membercarried b the sleeve, a spiral gear carried by said s aft `andmeshingwith said worm gear, a movable bearing attached to the end ofsaid shaft, a spring engaging the bearing for normall moving said shaftendwise for engaging said clutch members, said drill spindle whenrestrained in the feeding move-` ment of the` drill operating torestrain the movement of the worm gear and to cause the shaft carryingthe clutch memberto move endwise against the action of thespring for searating the clutch members.

n testimony whereof, I aiix my signature.

EDWARD J OSLIN KINGSBURY.

